如何使用按钮从 QLineEdit() pyqt5 中获取值 [英] How to get value form QLineEdit() pyqt5 with pushing button

问题描述

我已经创建了 QLineEdit 对象并试图从这个小部件中获取值，但最后我遇到了一个错误:

I have created the QLineEdit object and trying to get valuse from this widget, but at the end I've got an error:

qlineedit1 = QLineEdit()
qlineedit1.setFixedSize(btn_x_size, btn_y_size)
gridLayout.addWidget(qlineedit1, i, j)        
value = range_btn.clicked.connect(self.get_value(qlineedit1))

@pyqtSlot()
def get_text(self, obj):
    textboxValue = obj.text()
    return textboxValue

<小时>

    text1 = range_btn.clicked.connect(self.get_text(qlineedit1))
TypeError: argument 1 has unexpected type 'str'

推荐答案

您的错误如下:

• 在 connect() 方法中，你必须输入函数的名称，而不是被评估的函数.

• To the connect() method you must put the name of the function, not the evaluated function.

连接不返回任何内容，因此值将始终为 None.

the connection does not return anything, so value will always be None.

GUI 异步工作，因为它们要获取连接中的数据无效，必须在槽中获取.

The GUIs work asynchronously because they want to obtain the data in the connection is not valid, you must obtain it in the slot.

如果你想传递额外的参数，你可以使用 lambda 函数:

if you want to pass additional parameters you could use the lambda function:

    qlineedit1 = QLineEdit()
    qlineedit1.setFixedSize(btn_x_size, btn_y_size)
    gridLayout.addWidget(qlineedit1, i, j)        
    range_btn.clicked.connect(lambda checked, obj=qlineedit1 : self.get_value(obj))

@pyqtSlot()
def get_text(self, obj):
    textboxValue = obj.text()
    print(textboxValue)

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